This is a power source for a Succor Punch or Powerwand. You can also make it into a zapper by plugging in a 1/8th inch phono plug and holding onto the wires.

Please notice the new, black plastic boxes! 

These new boxes are a big improvement over the old, beige boxes. This new, slenderer box has a lid that snaps on and won't fall off, like the old ones! No more rubber bands required, to hold it together.